ITPEC IP October 2025 Question 75
Which of the following is the case example where Bluetooth is used as a standard protocol of wireless communications for cellular phones, household electric appliances, or such other devices?
Explanation
Connecting two controllers to a home video game console without cables — Bluetooth is a short-range radio standard for linking nearby devices.
Bluetooth uses the 2.4 GHz band over a range of about 10 m to connect peripherals such as controllers, keyboards, mice, headsets and smartphones to a host without cables. One host can connect several devices at once, so a console with two wireless controllers is a typical case.
Answer (a)
Why not others:
- •(b) — a car navigation system receives signals broadcast by GPS satellites, a one-way satellite positioning system, not Bluetooth
- •(c) — a cellular phone reads a QR code optically, with its camera and image processing; no wireless communication is involved
- •(d) — an automatic ticket gate reads an IC card ticket by contactless NFC/RFID over a few centimetres, not by Bluetooth
Key rule: Short-range wireless interfaces differ by medium and distance: Bluetooth is radio over about 10 m for peripherals, NFC radio over a few centimetres for cards and touch payment, IrDA infrared in line of sight; GPS is satellite positioning.
Computer Component · AI-written, may contain errors
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